JavaScript boy and “lovely thoughtleader” 
he/him 
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The most valuable thing I’ve learnt over the course of building replacements to tools, is that better performance isn’t always a good enough motivator for adoption. You need something else to justify and draw users in. Caches do a lot for warm starts.
Babel never claimed performance improvements over the alternatives. It offered an easy-to-use flexible solution. Yarn focused on performance AND ergonomics, nicer CLI, reproducible installs etc.
I’m referring specifically to build and developer tools. UI and product code is a different ballpark entirely where performance DOES matter and can be a justification on it’s own. More $$$ on the line.
Babel was several times slower than jstransform when I started using it. I remember my first (and only) PRs were focused on improving that just because I was already fully sold on Babel.
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